Purpose The purpose of this study was to investigate the impact of leadership styles on collection development practices in academic libraries within Ekiti State, Nigeria. Design/methodology/approach The research used a survey research design, using a questionnaire as the primary data collection instrument. The study encompassed 86 library personnel selected from six academic libraries in Ekiti State. Findings The study’s findings revealed a notably high level of engagement in collection development practices within the academic libraries under investigation. In addition, the library managers exhibited a blend of leadership styles, with the democratic style being the most frequently used, followed by autocratic and laissez-faire styles. Furthermore, the research identified a significant influence of leadership styles on collection development practices, with evidence suggesting a collective impact when considering various leadership styles together. Social implications The study implies that effective leadership plays a crucial role in realizing the overarching objectives of academic libraries, and a well-informed leadership approach positively impacts the library’s ability to meet its collection development goals and serve its academic community effectively. Originality/value This study contributes to the existing body of knowledge by shedding light on the intricate relationship between leadership styles and collection development practices in academic libraries. The identification of a predominant democratic leadership style and its implications on library practices provides a nuanced understanding of leadership dynamics in this context.